IDEALS Home University of Illinois at Urbana-Champaign logo The Alma Mater The Main Quad

Low-temperature thermal expansion of amorphous solids

Show full item record

Bookmark or cite this item: http://hdl.handle.net/2142/25398

Files in this item

File Description Format
PDF 1982_ackerman.pdf (3MB) Restricted to U of Illinois 1982_ackerman PDF
Title: Low-temperature thermal expansion of amorphous solids
Author(s): Ackerman, David Alan
Doctoral Committee Chair(s): Anderson, A.C.
Department / Program: Physics
Discipline: Physics
Degree: Ph.D.
Genre: Dissertation
Subject(s): low-temperature thermal expansion amorphous solids specific heat thermal conductivity ultrasonic dispersion
Abstract: For most amorphous materials at temperatures below ~ 1 K, the magnitudes and temperature dependences of specific heat, thermal conductivity and ultrasonic dispersion are qualitatively similar, independent of chemical composition. It has been suggested that thermal expansion also exhibits this universal behavior. The development of a dilatometer cap- 12 able of resolving sample strains as small as 10 has permitted measurement of the linear thermal expansion of various glasses below 1 K. These investigations ha\"e demonstrated, however, that the low-temperature thermal expansion coefficient of glasses can be positive, negative, large or small. analysis of measurements performed. on two types of vitreous silica, two amorphous polymers, As2S3 and Zr02 : Y 203 is presented in the context of the phenonenclogical tunneling-states model Consistency in explanation of thermal expansion and ultrasonic behavior maintained by assuming a broad, weakly energy-dependent distribution of coupling strengths between phonons and the localized excitations thought to be characteristic of the glassy state.
Issue Date: 1982
Genre: Dissertation / Thesis
Type: Text
Language: English
URI: http://hdl.handle.net/2142/25398
Rights Information: Copyright 1982 David Alan Ackerman
Date Available in IDEALS: 2011-06-13
Identifier in Online Catalog: 19409
 

This item appears in the following Collection(s)

Show full item record

Item Statistics

  • Total Downloads: 1
  • Downloads this Month: 0
  • Downloads Today: 0

Browse

My Account

Information

Access Key